If you want testimonial slider with all option then select testimonial format and then select "dots" option.
and If you want heading then select heading section then select "show" option. If you hide heading then
select heading section then select "hide" section and If you can change background color and Image
then you can change if you want show only button arrow then select "arrow button" section.
If you want testimonial slider without button, without arrow then select testimonial format then select "dots" section.
If you hide author details then select author details and select "hide" option.
and you can change also backgrund color and image.